WIND EFFECTS ON TALL BUILDINGS: A CAMPARISON OF MAJOR INTERNATIONAL CODES

Abstract

This M.Tech thesis gives a rigorous and systematic comparative examination of worldwide and national wind loading standards, with a special emphasis on the Indian Standard IS 875 (Part 3) 2015 and American Society of Civil Engineers standard ASCE 7-22. This study's primary objective is to investigate and compare the wind-induced responses of high-rise buildings predicted by both codes, highlighting important discrepancies and their practical consequences for structural design. The study uses dynamic analysis method to evaluate the wind load effects on a number of tall buildings with different geometrical shapes. Buildings of 130 meters in height with various cross- sectional shapes (such as rectangular, octagonal) were studied In order to gain a clearer understanding of effect of geometry on Wind response. In addition, an 65-meter-tall building was included in the research to extend the scope and assess the impact of height variation on wind behaviour. For consistency, the comparison analysis was carried out using terrain category 3 as described by both standards. Key aspects investigated include design wind pressure distribution in relation to height, base shear, storey drift and storey displacement. These metrics were chosen to provide a full understanding of structural performance and safety consequences. The findings of this study reveal considerable discrepancies in wind pressure calculations and structural responses resulting from the two standards. These variations are examined critically in terms of their impact on structural design practices, cost consequences, and safety margins. The analysis not only discloses each code's underlying conservatism or leniency, but it also emphasizes the need of adopting a design standard that is suited for the specific regional and structural context. Finally, the findings of this thesis contribute to a more comprehensive understanding of wind load behavior in high-rise structures, providing significant insights for structural engineers, code developers, and academics. This study intends to improve the resilience, the structural integrity and performance of high-rise buildings in regions prone to strong winds by closing the design gap between international and Indian requirements.